You must contact the company to which you are having issues with. I believe that Facebook owns Classmates. Perhaps you need to contact the Better Business Bureau of California. I am certain if you contact them, they will assist you in your efforts. This is just advisement, and you must do your due diligence that you have extinguished all of your avenues to recover your payments, prior to contacting them. It will help in your argument!!
by the way, you do understand that we DO NOT HAVE ANYTHING to do with your being billed right? What motivated you to trust that we could assist you in stopping payment? Please, I beg you please, let us know what motivated you to make us aware?